Crop Protection
Pests, diseases and weeds, chemical and biological control, resistance, integrated pest management and ecosystem effects.
How to study Higher Biology
Move from accurate biological mechanisms to unfamiliar data, experimental evidence and justified conclusions. Use current official materials for the written, extended-response and controlled-assignment formats that this question bank does not reproduce.
Core concepts
Concept 1
Explain how pests, pathogens and competing plants reduce crop productivity.
Exam cue: Explain how pests, pathogens and competing plants reduce crop productivity.
Concept 2
Compare chemical pesticides, biological control and integrated pest-management strategies.
Exam cue: Compare chemical pesticides, biological control and integrated pest-management strategies.
Concept 3
Use selection pressure, toxicity, persistence, specificity and food-web effects to evaluate control.
Exam cue: Use selection pressure, toxicity, persistence, specificity and food-web effects to evaluate control.
Risk pitfalls and guardrails
Pesticides select existing resistant variants; they do not create resistance because organisms need it.
Guardrail: Check vocabulary, sequence, direction, compartment, units and whether the evidence supports causation or only an association.
A biological control agent must be evaluated for non-target and invasive effects.
Guardrail: Check vocabulary, sequence, direction, compartment, units and whether the evidence supports causation or only an association.
Memory anchors
Integrated pest management
Monitor, threshold, combine controls, review.
Resistance
Susceptible die; resistant survivors reproduce.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
How do weeds reduce crop productivity?
Which combination is typical of successful annual weeds?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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